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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Effective income tax rate 18.20% 25.90%
Discrete income tax expense (benefit) $ (8)  
Effective income tax rate, related to repatriation strategies 3  
Effective income tax rate, reserves due to expiration of statute of limitations and settlements with taxing authorities $ 4